/* JAI-Ext - OpenSource Java Advanced Image Extensions Library
 *    http://www.geo-solutions.it/
 *    Copyright 2018 GeoSolutions
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

/*
 *  Copyright (c) 2011, Michael Bedward. All rights reserved.
 *
 *  Redistribution and use in source and binary forms, with or without modification,
 *  are permitted provided that the following conditions are met:
 *
 *  - Redistributions of source code must retain the above copyright notice, this
 *    list of conditions and the following disclaimer.
 *
 *  - Redistributions in binary form must reproduce the above copyright notice, this
 *    list of conditions and the following disclaimer in the documentation and/or
 *    other materials provided with the distribution.
 *
 *  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
 *  ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 *  WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 *  DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR
 *  ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 *  (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 *  LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
 *  ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 *  (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 *  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

package org.eclipse.imagen.media.jiffle;

import java.io.InputStream;
import java.util.Properties;
import org.eclipse.imagen.media.jiffle.runtime.JiffleRuntime;

/**
 * Helper class which reads the Jiffle properties file and provides values to other classes. It is used by
 * {@link Jiffle} and {@link org.eclipse.imagen.media.jiffle.parser.AbstractSourceGenerator}.
 *
 * @author Michael Bedward
 * @since 0.1
 * @version $Id$
 */
public class JiffleProperties {

    private static final Properties properties = new Properties();

    /** Properties file name. */
    public static final String PROPERTIES_FILE = "META-INF/org/eclipse/imagen/media/jiffle/Jiffle.properties";

    /** Key: default toot name for a Jiffle instance. */
    public static final String NAME_KEY = "root.name";

    /** Key: runtime class package */
    public static final String RUNTIME_PACKAGE_KEY = "runtime.package";

    /** Key: direct runtime class name. */
    public static final String DIRECT_CLASS_KEY = "direct.class";

    /** Key: direct runtime base class name. */
    public static final String DIRECT_BASE_CLASS_KEY = "direct.base.class";

    /** Key: indirect runtime class name. */
    public static final String INDIRECT_CLASS_KEY = "indirect.class";

    /** Key: indirect runtime base class name. */
    public static final String INDIRECT_BASE_CLASS_KEY = "indirect.base.class";

    /** Key: default runtime imports. */
    public static final String IMPORTS_KEY = "runtime.imports";

    /** Delimiter used to separate multiple import entries */
    public static final String RUNTIME_IMPORTS_DELIM = ";";

    /** Key: common runtime source generation templates. */
    public static final String COMMON_SOURCE_TEMPLATES_KEY = "common.source.templates";

    /** Key: direct runtime source generation templates. */
    public static final String DIRECT_SOURCE_TEMPLATES_KEY = "direct.source.templates";

    /** Key: indirect runtime source generation templates. */
    public static final String INDIRECT_SOURCE_TEMPLATES_KEY = "indirect.source.templates";

    /** Default base class for direct runtime classes. */
    public static final Class<? extends JiffleRuntime> DEFAULT_DIRECT_BASE_CLASS;

    /** Default base class for indirect runtime classes. */
    public static final Class<? extends JiffleRuntime> DEFAULT_INDIRECT_BASE_CLASS;

    static {
        InputStream in = null;
        try {
            in = Jiffle.class.getClassLoader().getResourceAsStream(PROPERTIES_FILE);
            properties.load(in);

            String className =
                    properties.getProperty(RUNTIME_PACKAGE_KEY) + "." + properties.getProperty(DIRECT_BASE_CLASS_KEY);

            DEFAULT_DIRECT_BASE_CLASS = (Class<? extends JiffleRuntime>) Class.forName(className);

            className =
                    properties.getProperty(RUNTIME_PACKAGE_KEY) + "." + properties.getProperty(INDIRECT_BASE_CLASS_KEY);

            DEFAULT_INDIRECT_BASE_CLASS = (Class<? extends JiffleRuntime>) Class.forName(className);

        } catch (Exception ex) {
            throw new IllegalArgumentException("Internal compiler error", ex);

        } finally {
            try {
                if (in != null) in.close();
            } catch (Exception ex) {
                // ignore
            }
        }
    }

    /**
     * Gets a property.
     *
     * @param key the property name (key)
     * @return property value
     */
    public static String get(String key) {
        return properties.getProperty(key);
    }
}
